Uncaught Error: This socket is closed. MQTT connectivity issues

What's the IP of the Espruino that's connecting?

192.168.0.18

And do you know what mqttjs_18553fd6 is?

I created an Electron App using the mqttjs module. My Electron app just sends a mqtt message every 30 seconds with updates about the status of my computer.

Electron App code:

      const shutdown = require('electron-shutdown-command');
      var lockYourWindows = require('lock-your-windows');
      var mqtt = require('mqtt');
      var client  = mqtt.connect('mqtt://192.168.0.17', [{protocolId: 'MQTT'}]);
      client.on('connect', function () {
        client.subscribe('#');
      })

      client.on('message', function (topic, message) {
        // message is Buffer
        var msg = message.toString();
        //console.log(topic.toString());

        if(msg == "lockscreen") {
          var isLocked = lockYourWindows.isLocked();
          lockYourWindows.lock();
        }

        if(msg == "shutdown") {
          //shutdown.logoff();
        }

        if(msg == "logoff") {
          shutdown.logoff();
        }
      });

      function isScreenLocked() {
        var isLocked = lockYourWindows.isLocked();
        var v = isLocked ? 1 : 0;
        client.publish('/mydevice/lockscreen/sta­tus', v.toString());
      }

      // Ever 30 seconds send a MQTT msg to nodered to update the Lockscreen Status Guage
      setInterval(isScreenLocked, 30000);

Espruino IDE console:

MQTT=> /mydevice/lockscreen/status 0
MQTT=> /mydevice/lockscreen/status 0
MQTT=> /mydevice/lockscreen/status 0
MQTT disconnected... reconnecting.

Here is a new log:

1533770037: New connection from 192.168.0.18 on port 1883. 1533770037:
New client connected from 192.168.0.18 as 4de309a8004f (c1, k60).
1533770095: Client a7c51f6bdcc7 has exceeded timeout, disconnecting.
1533770095: Socket error on client a7c51f6bdcc7, disconnecting.
1533770363: New connection from 192.168.0.9 on port 1883. 1533770363:
New client connected from 192.168.0.9 as mqttjs_6ce48170 (c1, k60).
1533770480: Client 4de309a8004f has exceeded timeout, disconnecting.